The winter in northern China is long and cold, and heating methods such as heating and geothermal have become the main means for people here to keep out the cold in winter. The thermal power plant transports the superheated steam to each first heat exchange station through the steam transmission pipeline. In the first heat exchange station, the steam heats the heating hot water through the heat exchanger, and the circulating pump sends the hot water to the secondary network and the various heat exchangers through the heating pipeline. user. Shanghai Qidian's D71 inverter has been widely used in municipal fields, such as heating, HVAC, water works and sewage treatment plants. Our products and solutions have remarkable energy-saving effects, safe and reliable operation, and are the guarantee for the stable operation of the municipal system.